Monday, October 12, 1998 Published at 09:50 GMT 10:50 UK
Potent research earns Nobel
The prize is given on the anniversary of the death of Alfred Nobel
The fundamental science that led to the anti-impotence drug Viagra has earned three US pharmacologists a Nobel prize.
Robert Furchgott, Louis Ignarro and Ferid Murad have won the 1998 Nobel Prize in Physiology or Medicine for their work on the role played by nitric oxide in transporting signals around the body's cardiovascular system - the heart and the network of blood vessels.
The scientists pieced together the evidence that proved nitric oxide, a gas, was the molecule regulating blood pressure and blood flow.
The Swedish Karolinska Institute, which judges the prestigious Nobel award, said in its citation: "It was a sensation that the simple, common air pollutant [nitric oxide], which is formed when nitrogen burns...could exert important functions in the organism."
The research promises a new generation of drugs to tackle a variety of problems in the cardiovascular system.
Studies of the gas have also shown that white blood cells use it to kill infectious invaders, and that it also can defend against tumours. This has led to tests to see whether nitric oxide could be used to halt tumour growth.
Scientists also believe the gas plays an important role in our sense of smell and memory.
Ferid Murad said on Monday he was surprised, exited and very happy with his award.
"I can not say that I expected it. I have been pondering the odds and thought that maybe I could win the prize, if not now maybe in a couple of years. But I have been trying not to care about it, so it was a pleasant surprise."
The prize is worth 7.6m kronar ($978,000) and is divided equally among the three scientists.
The winners are not generally known outside the medical community, but their discoveries have far-reaching consequences for human healthcare. Past laureates include Ivan Pavlov, tuberculosis pioneer Robert Koch, and DNA researchers Francis Crick and James Watson.
The medicine prize was the second of the six Nobels to be announced this year. Last Thursday, the literature prize went to Portuguese novelist Jose Saramago.
The prizes are presented on 10 December, the anniversary of the death of Alfred Nobel, the industrialist and inventor of dynamite whose will established the prizes.